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RC522 Datasheet(PDF) 61 Page - NXP Semiconductors |
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RC522 Datasheet(HTML) 61 Page - NXP Semiconductors |
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61 / 109 page  112132 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 3.2 — 22 May 2007 61 of 109 NXP Semiconductors MFRC522 Contactless Reader IC 11. Analog Interface and Contactless UART 11.1 General The integrated contactless UART supports the external host online with framing and error checking of the protocol requirements up to 848 kbit/s. An external circuit can to be connected to the communication interface pins MFIN/MFOUT to modulate and demodulate the data. The contactless UART handles the protocol requirements for the communication schemes in co-operation with the host. The protocol handling itself generates bit- and byte-oriented framing and handles error detection like Parity and CRC according to the different contactless communication schemes. Remark: The size and the tuning of the antenna and the power supply voltage have an important impact on the achievable operating distance. 11.2 TX Driver The signal delivered on pin TX1 and pin TX2 is the 13.56 MHz energy carrier modulated by an envelope signal. It can be used to drive an antenna directly, using a few passive components for matching and filtering, see Section 24 “Application information”. The signal on TX1 and TX2 can be configured by the register TxControlReg, see Section 9.2.2.5 “TxControlReg”. The modulation index can be set by adjusting the impedance of the drivers. The impedance of the p-driver can be configured by the registers CWGsPReg and ModGsPReg. The impedance of the n-driver can be configured by the register GsNReg. Furthermore, the modulation index depends on the antenna design and tuning. The register TxModeReg and TxAutoSelReg control the data rate and framing during transmission and the setting of the antenna driver to support the different requirements at the different modes and transfer speeds. Table 145: Settings for TX1 TX1RFEn Force 100ASK InVTx1 RFON InVTx1 RFOFF Envelope TX1 GSPMos GSNMos Remarks 0 X xxxx xx not specified if RF is switched off 1 0 0 x 0 RF pMod nMod 100% ASK: TX1 pulled to 0, independent of InvTx1RFOff 1RF pCW nCW 0 1 X 0 RF pMod nMod 1RF pCW nCW 1 1 x 0 0 pMod nMod 1RF_n pCW nCW |
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